United States Department of Transportation
i
Variability of the IDEAL-CT Test for Pavement Cracking to Achieve a Balanced Asphalt Mix Design
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2023-02-01
[PDF-1.18 MB]
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Edition:Final Report
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Abstract:This report describes the research efforts aimed at determining the repeatability of the IDEAL-CT test for use as part of the balanced asphalt mix design process. Three mixes in common production in the Northern part of Utah were investigated by three different labs experienced in performance testing. Within lab and between lab variability were studied as well as a number of factors likely to cause variability. Recommendations were developed for specimen preparation, minimum number of replicates, and how to discard outliers. It was found that the test could be repeated within laboratory within a coefficient of variation, CV, of 15% and between laboratories within a CV value of 20%. using properly trimmed results. Four replicates are recommended with the result farthest from the mean discarded. No correlation between higher CT index and greater durability was identified in this study.
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